目的建立液相色谱-串联质谱法检测金属罐中三(壬基酚)亚磷酸酯迁移量的分析方法。方法金属罐经水、4%乙酸、10%乙醇、20%乙醇、50%乙醇等食品模拟物迁移后,过滤,采用大气压化学电离(atmosphere pressure chemical ionization,APCI)和多...目的建立液相色谱-串联质谱法检测金属罐中三(壬基酚)亚磷酸酯迁移量的分析方法。方法金属罐经水、4%乙酸、10%乙醇、20%乙醇、50%乙醇等食品模拟物迁移后,过滤,采用大气压化学电离(atmosphere pressure chemical ionization,APCI)和多反应监测模式(multiple reaction monitoring,MRM)进行检测,外标法定量。结果三(壬基酚)亚磷酸酯在10~500μg/L范围内呈现良好的线性关系,相关系数不低于0.9997,检出限为0.005 mg/L,测定结果的相对标准偏差不大于5%(n=6),加标回收率为94.20%~106.40%。结论该方法准确、精密度好,可用于金属罐中三(壬基酚)亚磷酸酯迁移量的快速检测。展开更多
An NM400 wear-resistant steel was hot rolled and then the plates were heat-treated by direct quenching and tempering （DQT） and reheat quenching and tempering （RQT） techniques, respectively. The Charpy impact test ...An NM400 wear-resistant steel was hot rolled and then the plates were heat-treated by direct quenching and tempering （DQT） and reheat quenching and tempering （RQT） techniques, respectively. The Charpy impact test was carried out with an instrumented Charpy impact tester. The microstructure and fracture surface were investiga-ted by a combination of optical microscopy, transmission electron microscopy and scanning electron microscopy methods. It was found that the impact toughness of DQT specimen was much higher than that of RQT specimen. The microstructure of both DQT and RQT specimens was characterized by a mixture of tempered lath martensite and lower hainite. The lower bainite in DQT specimen extended into prior austenite grains and the content was higher than that in RQT specimen. The lower bainite in DOT specimen improved the impact toughness by increasing the proportion of large-angle boundaries and relieving the stress concentration at the crack tip. A number of fine and dis-persed carbides in DQT specimen also contributed to the improvement of the impact toughness.展开更多
基金Item Sponsored by National Natural Science Foundation of China(51074052)
文摘An NM400 wear-resistant steel was hot rolled and then the plates were heat-treated by direct quenching and tempering （DQT） and reheat quenching and tempering （RQT） techniques, respectively. The Charpy impact test was carried out with an instrumented Charpy impact tester. The microstructure and fracture surface were investiga-ted by a combination of optical microscopy, transmission electron microscopy and scanning electron microscopy methods. It was found that the impact toughness of DQT specimen was much higher than that of RQT specimen. The microstructure of both DQT and RQT specimens was characterized by a mixture of tempered lath martensite and lower hainite. The lower bainite in DQT specimen extended into prior austenite grains and the content was higher than that in RQT specimen. The lower bainite in DOT specimen improved the impact toughness by increasing the proportion of large-angle boundaries and relieving the stress concentration at the crack tip. A number of fine and dis-persed carbides in DQT specimen also contributed to the improvement of the impact toughness.
